An “intelligent” program was developed on a microcomputer to help students improve their logical reasoning skills. The program is based on the popular two-person game of “Mastermind” and provides feedback for less than optimal performance. In addition to playing the game with a student, the program checks to see if he or she is using all available information. If not, the program indicates the information that is being overlooked. High performance at successive levels of difficulty produces reliable improvement on equivalent forms of standardized tests of logical thinking skills.